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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b2d4fad60488b46d251a4cbc6b5e2f5811f4388ad20f0c931e042306ae400a8' 
  AND token = 'soJ413yDftOjTRoGU6ytLqfQepIKk/Di3RpdgNPaWh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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