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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11b3cb47e221f48396b4c06a3b08115e09e56b54ed3f5b9ec19e8b6be4b05481' 
  AND token = 'KKnGbsGUGHsbLRReULgiG7OurgWX/ABAHg3CWOuftQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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