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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd75e062a68dd0665c14a905e1e016e6f21c09e0c812b61088e16a7649daec3fb' 
  AND token = 'iJAuCy2RT0bOEUsSABMFwMQWwjRp0wCD/8W4wLMGEQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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