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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5510660ad44c43588664c40a7a6351184c50731c711404c53f00b3b813f6be64' 
  AND token = 'DAxa24D/UCqDcx24KGwhYf2Mc5xCvUbeAir6QLVLiHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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