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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '836c2c851c07325dc00b90100f5435bb53fa9a320662635af5f573cec559e6e4' 
  AND token = 'SwtGBftSY2a24yo+uxYDa+XEd9PQ69BFypkXC32sl7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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