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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c3fa8ed5daec6781dfcd7d82a7d7e5317c1b81ca038843ba4df23b805a6e147' 
  AND token = '1wsidQlwMIB4qjHokNd+3aY8y5nTGtOkok/9UkH/LSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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