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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afa42ea16e44dd33a97438529230e2973fbfb721a4167ca625848de68da9afa7' 
  AND token = 'cgfL9J+ztW11DMDRA+oD85w9mWG3lOj4yLNqre1D/iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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