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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bb4e6ed5d2591b1c85531f8b56417df175ff1a569d59ec7719deaf2afef88a4' 
  AND token = '1saM1mWJwrLozOuFoh/1L3oQYj93Y9S/7SxO52WJCrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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