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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51c1daac88ef99b0ee708ab8eba5e344ce77fe35402dc738932bb0773cd89a48' 
  AND token = 's+J4QFWHJSYSmkaMTJLKXybYEkCDf61MIcrk5PRjyD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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