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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0ceb3645de4c1b6ca9b8a08e35f9b070f196521c9fe79e4b2f8a6991779d1b7' 
  AND token = 'Xfl8NdPf/9siKPoSjy/Py7hEbiZza1ySjXGLbiAqDiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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