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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3069940d6e922a8fa43dff2070312209fe179f53cec38c435789e883e9f6a6' 
  AND token = 'Xvzab3pkYeAbvdMtdwdb/tI9tERiY6nsoWQOk9wIPJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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