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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '381223aafd7bbc6c75e401f68f652326a607a4a9a665eb0f30363b5b3d892e1e' 
  AND token = 'A9481PeRV3vIrzA43dQASdVSfKDYNsmyxpnS9vcHLbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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