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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6682048e696ed0267e3c89791af96908e422c988d72d76698b3b36fc4257fbfd' 
  AND token = '2cNXlpaOWSdjK+jpQshzecW0LaRbUlFQmqEKjfvqhAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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