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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '733903523956a32e198e6804d8de069775f6fb2d6e577e55a18e89f35bc7494e' 
  AND token = 'EDG0xMTaTR96KXDKFPwtL+CwPd6sOmi4K1kXYKWkiWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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