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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc79f7fb6a8e8ccb8019fe58e7683e7db516e331732e1eea4bd88c80e549432f' 
  AND token = 'WF+Qg9SywtdMA+AKd9JL1aqE/fx8Huq1a4yCA2v3LCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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