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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c32c34d13f3b8f1d99e8fe3414e2b0f00c5146ac4421bc0b0cc856384da159c2' 
  AND token = 'joxeXrKzp6+/Z++XlomGyFlwewh9SUtt6dbiZduN8k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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