SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a623e22abcf0bc55da2f79b26dc1df1cf2d4604556c873c2f9b87ffa02ff55f' 
  AND token = 'DoMKo4a/VuJluhsa3aF7SINaB+Tj/CCmUInKhH43SxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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