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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bb72f4d8eef2861182d3f353477cc522b1a9d361ba789d4241f4cdff074dbe0' 
  AND token = '/pP2l0LGIn3U2p3rtAguMfr4iI4mI0mukOBIpFtZSGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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