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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '670017168e6498d347a14054b1d80698a7b788981a9b261a29d052c2d18ad727' 
  AND token = '2Xsls2kF1RGo+XyC1kFr7Bnk/Cw1fhnJJpp/Vqn8WEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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