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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '525c849744c347069d2ef08e7cd28584673e361f2ae21a36cef16a1e83de4244' 
  AND token = 'rpXq9JNyXfnni8GXdKxT5vi25p0JiGUOWTht3fmLkYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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