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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9207a13b6bbf87b5c94cf50dea0a1a8ef21456db2c33e41c50e63b077153a6f4' 
  AND token = 'Adl83iPZ2Yv7JeERQ9tNMcBEZPB/eynU36FoqsHNpsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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