SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1216e3931ed401b44da46151ca18de2d949c340aeff6fba8ce13d7bd7d289c4c' 
  AND token = 'MZALRDKM2uYH9nh+g9CAwhJjhUv0iNh+t5Xm2mr7zN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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