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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38119b6ff6ac108cce6dcd49a4b6b89048fc1de4c5f90e9e181fb7a200986df2' 
  AND token = '2uVXj11s0wdH9R9isMXCp5Ew9+ipt6nKQqpit2ISmeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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