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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dcab63cc3198a9535826a3404aa36e685c0a992fc1e3702a8e1add4ca7ec9c2' 
  AND token = '3jEgn7Vo2S3qH3HxnQDKT+67G+owZMCr2JvXh6s9n+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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