SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8eb1c57b2afb51228621e8e6eb773dea55e337e3f0409d6337068185629baaf' 
  AND token = 'ih6YJTdigDxz25wtMR2TPq2vf94zMqBXMZotJCpxezU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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