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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd57d93000dca3569073068119110dbff30313010931376cacb924b36c8c074b3' 
  AND token = 'X3H98ciLxnYy4AdfwIQxHF4u0sabQ4yR/9qg0ukKS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}