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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5f122bd6f5889e21cec1222c25893c409d613fa2621c3fee9a0bcdab90d9f44' 
  AND token = '2huw+LDUGUCtRPAbBDPkCY7ucMO2U8zV3+h2Cd5Kzhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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