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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd01402650c18dbbc55fd4969d9a7091ae079c678c7515b56b91e042963b72c71' 
  AND token = '1VUQ8Ojf0JAT0oZ34E75aDBhIvVdWaXES7+bxTEce7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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