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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a88647009292abd4aacb5918cc8e0e4abf93956c89868800b37160abfce137a' 
  AND token = 'Qag3aXU+xtHokcfacIGT+wHilBNhzdZB/CC4EpXIB58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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