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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53fa9891c177f18c9876d6a0a5956bb044b9cd857fe988dcf7c766efed46662d' 
  AND token = 'bzjJcsk9Y9RYkjmYnaNQyl43ZBUFFFm5O2qwxW2QpaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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