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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd320ca398a83c5f34b563ed2e33ab250ea3f330f7494f7a40c13805b483c806d' 
  AND token = 'D6N/Txxwk6kf5eGiedmvioldIcaA8d2rZ1lCd+aE++g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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