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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ecae17a868a9b2882c209a189d193b50fcfa0b5f79e59a869d0b96a394eb33a' 
  AND token = '9eDT4HJ+ifkbWYqdpkrTtMCTAH35lWdjSgILdv3RShE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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