SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f1cafd7bd9602818c42441082bde3255bc47e3091f3a06db8dc83c9bb9c0ba' 
  AND token = 'q3vdo5xjWkHMDG+6sK48I2bKKi81hQVup/ycwold6s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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