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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f401b7b7f5be092f447c6bfa4d7b87d0e03bb36280322f15a380946858e616a' 
  AND token = 'S0WGfcNM1145uKpnEDZBKTjNlc8BpeaHYdLV1ijcRYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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