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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '743eb57eee9ab1d2c587904c0e40502b86196278f3d2e4d770ee722765aa1f4a' 
  AND token = 'QD6oQtijcFBOjZ5jhAyvZKp1JRih46dHXOhfBCKOPnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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