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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44b27e73de59cab4fafddc1614cce0b36d7df2582fd9b0be0ac7f495ce3b12f3' 
  AND token = 'c4EUMdSWCm76raYQoOqGXdoVv6hslcvFk0h8JL5v5HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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