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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e16e60136f415988bab0e96988f60d44e5460add299f47f25a5f7aea42c033' 
  AND token = '1EgLT3m81Xr6CTmDI5eLurM4QIFx8CcwJ14dFN5g274=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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