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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1bed758f5c7e0b1b773e8a1c37643745194bedc6cc98824c8ed9dd80447f91b' 
  AND token = 'vNYYXKrqksQkqR8RferYzaYoAEFWlQ7oHYDDIMH6YPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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