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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b963af26f20479a5750ddc63b7f2e6416a79d1eb4eaab386cce7a02793dbef67' 
  AND token = 'K9xIt4wwhARH0WSkXC43HURIZKtBz5ixsIjgMxrC7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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