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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '276d152bf0bc914f27daf46f00f1a50bb566b92716867992a642ca2ce99662fd' 
  AND token = '/ImvHB98tufL67pJYBv/GVnuxI2LeKJNGfvS11kSTaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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