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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '734bafc75cab2faa870edb58c41d9023fea321714491f5e546bc78ab2480d169' 
  AND token = 'KZ0kbV8t3Nnn5xdBTKtixHFC4pEf6gwYSPZarm0l8u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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