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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3e1261a26aa0fe13ef2158c1013517da883218a6f1172ced24c61aee797b4ab' 
  AND token = 'EZekT0eq+ptq9cfZCEDId3EU7SmcBmLGQdbNfJeqySA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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