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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd19414bf770c5b3228ee27cea612744a64c031d54b897aa9957a41f48b3dfc14' 
  AND token = 'R5cTkMLnkg79rOJMLJYVZplaMBUpbPHBM4sJB1fE/2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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