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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8280825822015ded80f96797e4f2bc54a0c56221771a5fbf5cc05be60e65cee' 
  AND token = '1jmv2A50k5fYc0cvd8CHbxwnCN8X3mUcKjMpYrzJjKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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