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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8abc047169016996614be6a707a9bb85784fd4307dc0b67353667e3fd5bba25' 
  AND token = '3l7eQZdl5PjhH4k6kvrkCySSnyZYDNDl7/oe2SGoVg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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