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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b2ed17c5a88bd79f9d106231d5d99d6913c6786c353a7392a146a409f2c2dd3' 
  AND token = '5rUYoqnarvbmDoAX1UgxZBs3xY+z9QDyDQz2fUmTR3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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