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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a24da4f36e836a2379829bc2ec84810e7a65b2ade1cec64f0cbb00b4300aa6f9' 
  AND token = 'z79t0kjulPlXNKClR0vNMK66zD/fKCh85vueQThr+3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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