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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7a48dc346ac5988179f3e72f78a5b14f95fa41dfc7c980584ab864713031dd7' 
  AND token = 'J5G6mYlJKTglONBe5QiqtOhDyADkk3KXJiDbE8PGnis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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