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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2358f6ce19b89189b8705598e6ebcf7c0f24d813e209d0e96c181ded1e907586' 
  AND token = '4cZUi2Ba7zDntFM9BNPZT8JkGfnuBZ5e/et5bIUDWNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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