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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46a17c7946698cd9c93b50f1dd0501d9669c3bbc1c92c5aac4a41b7a3429c179' 
  AND token = 'TThGTOnvtLMrxrPqyheh3+rZ55TIOux519B30e5RCv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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