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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1966ddb2bce371d0d675fa317508a7e17d30f0dca644693b28c054ea24bd2554' 
  AND token = 'cKAgDqoQEr+rsj7Cit913LjrNcIB1x1P8gSBodHv2y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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