SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17552de78df861f1c3426eb41521053dbf091393bb05bc08a44561e0331f8b5a' 
  AND token = 'rZ67LsAEety9IULVLvBUbruX/i5yGgVTT9j8J7hwjHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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