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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8468339699902620e84fe68285c89a4e4a3d90a2e6a384326991d92cdea6c2f5' 
  AND token = 'Tt3R8yyGmXcViDph3zoBj/4sHphgEizmi8ZsgpRVboA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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