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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ead205a21a6961593336f13aef514658cf56904c8a1339981f60f1f68f11daa9' 
  AND token = 'xTKf9v3UQl0p0g1ai3NDaCiw5kSdCBMY/tuq+qCGqQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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