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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbfc692d43c8d916c9403aeeb82c7c66bb744aa32558a03dee61be6bd56b4ea4' 
  AND token = '2ipaDLY/KeDyAgWyBgLFBHzTpIn6SiuhKFiPLR+6Jks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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