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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c4dcc7135c3067bb6488c4e0e4bbf6633db843e5521841fffc0feb2f87e08db' 
  AND token = 'XJR6kgNkMULTlr2TiKrQUgNSJvXC5zSSKaBm30DzsMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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