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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b7d401de4f82ae887f6077ea216cdbc4a34a5fa794dc3f2ea6ca1276ccdab80' 
  AND token = '5cNeudhhDp0dhi0uIvd2ywAKthQMcYuPrjp1JmadW7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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