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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ef8c2540896dc4137301b3767a7f491c11122888acedb1541ac43df72048deb' 
  AND token = 'U+yYEZMdTP5gpsfTcMLce00qjEB4++rDHPuyV1P2rVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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